Lamp base



FIG. 1 is a perspective view of the lamp base comprising my new design;

FIG. 2 is an elevational view of first side of my lamp base design;

FIG. 3 is a top plan view of my lamp base design;

FIG. 4 is an elevational view of a second side of my lamp base design; and,

FIG. 5 is a perspective view of an alternative embodiment of my lamp base design as claimed the only difference being the translucent appearance of the surface.

The broken lines shown in FIG. 5 are for illustrative purposes only and form no part of the claimed design. The nature of the surfacing contouring in FIGS. 1-5 denotes an undulating rippled contour appearance. The surface or portion of the article not shown in FIGS. 1-5 forms no part of the claimed design. 

The ornamental design for a lamp base, as shown and described. 